You can set up a Circle for your family or friends and share your Premium Service subscription.
To do so, first, subscribe to Premium Service. (iSharing > Menu > Premium service)
Then, create a circle for your family or friends and invite all members that you want to share your Premium Service subscription with.
Please note that your circle members can use Premium Service, but it will be limited to the specific circle. They need to be viewing your specific circle through the circle selector. Then, they will be able to use Premium Service features.